{"id":6560,"date":"2010-08-31T21:09:29","date_gmt":"2010-08-31T21:09:29","guid":{"rendered":"http:\/\/cimss.ssec.wisc.edu\/satellite-blog\/?p=6560"},"modified":"2010-09-01T21:02:26","modified_gmt":"2010-09-01T21:02:26","slug":"hurricane-earl-produces-a-low-level-outflow-boundary","status":"publish","type":"post","link":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/archives\/6560","title":{"rendered":"Hurricane Earl produces a low-level outflow boundary"},"content":{"rendered":"
\"GOES-13<\/a>

GOES-13 6.5 \u00c2\u00b5m "water vapor channel" images<\/p><\/div>\n

Evidence of a large region of mid-tropospheric dry air on AWIPS images of GOES-13 6.5 \u00c2\u00b5m “water vapor channel” data (above; also available as a QuickTime movie<\/a>)<\/strong><\/em> in tandem with an increase in southwesterly deep layer wind shear<\/strong><\/a> was helping to erode the upper level cloud canopy over the western portion of Category 4 Hurricane Earl<\/strong><\/a> — this allowed a well defined low-level outflow boundary to be seen on McIDAS images of GOES-13 0.63 \u00c2\u00b5m visible channel data (below; also available as a QuickTime movie<\/a>)<\/strong><\/em> on 31 August 2010<\/strong><\/a>.<\/p>\n

It is also interesting to note the westward-propagating “shock waves” that were emanating from Hurricane Earl, which could be seen on the water vapor imagery in the dry region (denoted by the predominantly yellow color enhancement)<\/em> over the western Atlantic Ocean.<\/p>\n

\"GOES-13<\/a>

GOES-13 0.63 \u00c2\u00b5m visible channel images<\/p><\/div>\n

A comparison of AWIPS images of the POES AVHRR 0.63 \u00c2\u00b5m visible and 10.8 \u00c2\u00b5m IR channel data (below)<\/strong><\/em> seemed to support the fact that this was indeed a low-level feature, with the narrow cloud band of the outflow boundary feature exhibiting fairly warm IR brightness temperatures of 0\u00c2\u00ba to +5\u00c2\u00ba C.<\/p>\n

\"POES<\/a>

POES AVHRR 0.63 \u00c2\u00b5m visible and 10.8 \u00c2\u00b5m IR images<\/p><\/div>\n

The POES AVHRR Cloud Top Height (CTH) product (below)<\/strong><\/em> gave maximum CTH values of 3-4 km (red color enhancement)<\/em> for the outflow boundary feature\u00c2\u00a0 — maximum CTH values near the center of Hurricane Earl were around 16 km (cyan color enhancement)<\/em>.<\/p>\n

\"POES<\/a>

POES AVHRR 10.8 \u00c2\u00b5m IR image and Cloud Top Height product<\/p><\/div>\n

Further confirmation that this was a low-level feature was provided by an examination of the AVHRR Cloud Type product (below),<\/strong><\/em> which indicated that the narrow outflow boundary cloud band was composed of water droplets (cyan color enhancement)<\/em>.<\/p>\n

\"POES<\/a>

POES AVHRR 0.63 \u00c2\u00b5m visible image and Cloud Type product<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Evidence of a large region of mid-tropospheric dry air on AWIPS images of GOES-13 6.5 \u00c2\u00b5m “water vapor channel” data (above; also available as a QuickTime movie) in tandem with an increase in southwesterly deep layer wind shear was helping to erode the upper level cloud canopy over the western portion of Category 4 Hurricane […]<\/p>\n","protected":false},"author":18,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[22,10,11,26,25,2],"tags":[],"class_list":["post-6560","post","type-post","status-publish","format-standard","hentry","category-avhrr","category-general-interpretation","category-goes-13","category-poes","category-satellite-winds","category-tropical-cyclones"],"acf":[],"_links":{"self":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/6560","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/comments?post=6560"}],"version-history":[{"count":16,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/6560\/revisions"}],"predecessor-version":[{"id":6597,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/posts\/6560\/revisions\/6597"}],"wp:attachment":[{"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/media?parent=6560"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/categories?post=6560"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cimss.ssec.wisc.edu\/satellite-blog\/wp-json\/wp\/v2\/tags?post=6560"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}